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Organization and Basis of Presentation - Summary Financial Information of VIEs and their Subsidiaries (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | ¥ 1,402,226 | ¥ 1,248,810 |  | $ 201,417
Short-term investments | 217,640 | 1,028,564 |  | 31,262
Prepaid expenses and other current assets | 180,881 | 124,908 |  | 25,982
Total current assets | 2,044,194 | 2,582,939 |  | 293,630
Right-of-use assets | 598,991 | 0 |  | 86,040
Total non-current assets | 1,924,508 | 1,156,199 |  | 276,438
TOTAL ASSETS | 3,968,702 | 3,739,138 |  | 570,068
Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of the consolidated VIEs without recourse to Sunlands Technology Group of RMB241,204 and RMB209,727 as of December 31, 2018 and 2019, respectively) | 435,225 | 455,284 |  | 62,516
Deferred revenue, current (including deferred revenue, current of the consolidated VIEs without recourse to Sunlands Technology Group of RMB1,765,085 and RMB1,162,938 as of December 31, 2018 and 2019, respectively) | 1,670,076 | 1,765,085 |  | 239,891
Lease liabilities, current | 40,236 |  |  | 5,780
Total current liabilities | 2,239,577 | 2,314,409 |  | 321,695
Deferred revenue, non-current (including deferred revenue, non-current of the consolidated VIEs without recourse to Sunlands Technology Group of RMB1,520,940 and RMB1,096,482 as of December 31, 2018 and 2019, respectively) | 1,558,694 | 1,520,940 |  | 223,892
Lease liabilities, non-current | 616,246 |  |  | 88,518
TOTAL LIABILITIES | 4,707,065 | 4,078,121 |  | $ 676,127
Net revenues | 2,049,461 | 1,973,985 | ¥ 970,162 |
Net (loss)/income | 590,728 | 393,063 | (606,946) |
Net cash generated from/(used in) operating activities | (480,084) | 1,448,005 | 845,616 |
Net cash (used in)/generated from investing activities | 522,104 | (315,198) | (375,802) |
Net cash (used in)/generated from financing activities |  | 8,018 | ¥ (391,237) |
VIEs |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Cash and cash equivalents | 69,539 | 80,371 |  |
Short-term investments | 38,990 | 587,051 |  |
Prepaid expenses and other current assets | 106,568 | 46,601 |  |
Total current assets | 284,887 | 818,480 |  |
Right-of-use assets | 340,302 |  |  |
Total non-current assets | 776,783 | 377,856 |  |
TOTAL ASSETS | 1,061,670 | 1,196,336 |  |
Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of the consolidated VIEs without recourse to Sunlands Technology Group of RMB241,204 and RMB209,727 as of December 31, 2018 and 2019, respectively) | 209,727 | 241,204 |  |
Deferred revenue, current (including deferred revenue, current of the consolidated VIEs without recourse to Sunlands Technology Group of RMB1,765,085 and RMB1,162,938 as of December 31, 2018 and 2019, respectively) | 1,162,938 | 1,765,085 |  |
Lease liabilities, current | 22,659 |  |  |
Total current liabilities | 1,395,324 | 2,006,289 |  |
Deferred revenue, non-current (including deferred revenue, non-current of the consolidated VIEs without recourse to Sunlands Technology Group of RMB1,520,940 and RMB1,096,482 as of December 31, 2018 and 2019, respectively) | 1,096,482 | 1,520,940 |  |
Lease liabilities, non-current | 358,467 |  |  |
TOTAL LIABILITIES | ¥ 2,854,823 | ¥ 3,527,364 |  |

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